i am planning on putting a performance cam in the 350 on my 77 Blazer. What do i need to loook for? I dont know anything about the duration, lift etc. 270? what do i need. I want lowend torque and a sort of choppy idle. PLease help. Its mostly for offroad, mostly mud bogging, i dont climb or anything. So i want the drag cams. I want it to be a good price too.